Deformation-induced cleaning of organically fouled membranes: Fundamentals and technoeconomic ass... more Deformation-induced cleaning of organically fouled membranes: Fundamentals and technoeconomic assessment for spiral-wound membranes The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Goon, Grace S.S. et al. "Deformation-induced cleaning of organically fouled membranes: Fundamentals and techno-economic assessment for spiral-wound membranes."
Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with ... more Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with an Abanico GRACE GOON, JOEL MARTHELOT, PEDRO REIS, Massachusetts Institute of Technology-Flexible hand-held fans, or abanicos, are universally employed as cooling devices that are both portable and sustainable. Their to and fro axial motion about one's hand generates an airflow that increases the evaporation rate near the skin and refreshes. We study this problem in the context of fluid-structure interaction, through precision model experiments. We first characterize the elastic properties of a number of commercially available fans and evaluate their aerodynamic performance in a custom built apparatus. The air velocity profile that results from the flapping motion of the fan is characterized for different driving conditions. We then fabricate our own analogue model fans that comprise a thin elastic plate, shaped as a circular section, with an underlying substructure of radial slats. A systematic variation of the geometric and elastic parameters, along with an exploration of the parameter space of the periodic driving motion (amplitude and frequency), allows us to establish optimal design and operational conditions for maximal output of the generated airflow, while minimizing the input power.
No material appearing in this publication may be reproduced without written permission of the pub... more No material appearing in this publication may be reproduced without written permission of the publisher. The opinions expressed in this magazine are those of the contributors and are not necessarily shared by the editors. All editorial rights are reserved.
We study the flow generated when a handheld fan is waved. This fluid-structure interaction proble... more We study the flow generated when a handheld fan is waved. This fluid-structure interaction problem is investigated through precision experiments, using an oscillating semi-circular elastic plate as a reduced analog model. The aerodynamic performance of the fans is systematically characterized for a variety of geometric and material parameters, as well as the amplitude of the periodic driving. We demonstrate that the bending stiffness of the structure can be tuned to maximize the output of the generated airflow, while simultaneously minimizing the input power. A design guideline is established for this optimal conditions based on matching the driving and the natural frequencies of the plate. Closer to the handheld fans, we then consider a discrete analog model comprising an array of overlapping strips. Unlike homogeneous plates, these discrete designs deform passively into shapes with finite Gaussian curvature and further enhance the generated flow. Finally, we explored the effect of...
Bulletin of the American Physical Society, Mar 3, 2015
Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with ... more Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with an Abanico GRACE GOON, JOEL MARTHELOT, PEDRO REIS, Massachusetts Institute of Technology-Flexible hand-held fans, or abanicos, are universally employed as cooling devices that are both portable and sustainable. Their to and fro axial motion about one's hand generates an airflow that increases the evaporation rate near the skin and refreshes. We study this problem in the context of fluid-structure interaction, through precision model experiments. We first characterize the elastic properties of a number of commercially available fans and evaluate their aerodynamic performance in a custom built apparatus. The air velocity profile that results from the flapping motion of the fan is characterized for different driving conditions. We then fabricate our own analogue model fans that comprise a thin elastic plate, shaped as a circular section, with an underlying substructure of radial slats. A systematic variation of the geometric and elastic parameters, along with an exploration of the parameter space of the periodic driving motion (amplitude and frequency), allows us to establish optimal design and operational conditions for maximal output of the generated airflow, while minimizing the input power.
Deformation-induced cleaning of organically fouled membranes: Fundamentals and technoeconomic ass... more Deformation-induced cleaning of organically fouled membranes: Fundamentals and technoeconomic assessment for spiral-wound membranes The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Goon, Grace S.S. et al. "Deformation-induced cleaning of organically fouled membranes: Fundamentals and techno-economic assessment for spiral-wound membranes."
Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with ... more Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with an Abanico GRACE GOON, JOEL MARTHELOT, PEDRO REIS, Massachusetts Institute of Technology-Flexible hand-held fans, or abanicos, are universally employed as cooling devices that are both portable and sustainable. Their to and fro axial motion about one's hand generates an airflow that increases the evaporation rate near the skin and refreshes. We study this problem in the context of fluid-structure interaction, through precision model experiments. We first characterize the elastic properties of a number of commercially available fans and evaluate their aerodynamic performance in a custom built apparatus. The air velocity profile that results from the flapping motion of the fan is characterized for different driving conditions. We then fabricate our own analogue model fans that comprise a thin elastic plate, shaped as a circular section, with an underlying substructure of radial slats. A systematic variation of the geometric and elastic parameters, along with an exploration of the parameter space of the periodic driving motion (amplitude and frequency), allows us to establish optimal design and operational conditions for maximal output of the generated airflow, while minimizing the input power.
No material appearing in this publication may be reproduced without written permission of the pub... more No material appearing in this publication may be reproduced without written permission of the publisher. The opinions expressed in this magazine are those of the contributors and are not necessarily shared by the editors. All editorial rights are reserved.
We study the flow generated when a handheld fan is waved. This fluid-structure interaction proble... more We study the flow generated when a handheld fan is waved. This fluid-structure interaction problem is investigated through precision experiments, using an oscillating semi-circular elastic plate as a reduced analog model. The aerodynamic performance of the fans is systematically characterized for a variety of geometric and material parameters, as well as the amplitude of the periodic driving. We demonstrate that the bending stiffness of the structure can be tuned to maximize the output of the generated airflow, while simultaneously minimizing the input power. A design guideline is established for this optimal conditions based on matching the driving and the natural frequencies of the plate. Closer to the handheld fans, we then consider a discrete analog model comprising an array of overlapping strips. Unlike homogeneous plates, these discrete designs deform passively into shapes with finite Gaussian curvature and further enhance the generated flow. Finally, we explored the effect of...
Bulletin of the American Physical Society, Mar 3, 2015
Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with ... more Submitted for the MAR15 Meeting of The American Physical Society Fanning the Optimal Breeze with an Abanico GRACE GOON, JOEL MARTHELOT, PEDRO REIS, Massachusetts Institute of Technology-Flexible hand-held fans, or abanicos, are universally employed as cooling devices that are both portable and sustainable. Their to and fro axial motion about one's hand generates an airflow that increases the evaporation rate near the skin and refreshes. We study this problem in the context of fluid-structure interaction, through precision model experiments. We first characterize the elastic properties of a number of commercially available fans and evaluate their aerodynamic performance in a custom built apparatus. The air velocity profile that results from the flapping motion of the fan is characterized for different driving conditions. We then fabricate our own analogue model fans that comprise a thin elastic plate, shaped as a circular section, with an underlying substructure of radial slats. A systematic variation of the geometric and elastic parameters, along with an exploration of the parameter space of the periodic driving motion (amplitude and frequency), allows us to establish optimal design and operational conditions for maximal output of the generated airflow, while minimizing the input power.
Uploads
Papers by Grace Goon